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Intestinal IgY and IgA ELISA titers of broiler chickens immunized intramuscularly with Clostridium perfringens purified proteins. The samples analyzed were from pooled intestines collected from at least 10 chickens in each group. Exp, experiment. In experiment 4A, the birds were challenged for 3 days and necropsied on day 6. In experiment 4B, the birds were given a severe challenge, like the one used in experiment 3.
